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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee7a4a3090d8bd4d5a309c1d00406ca59ecc1c7283cf09adf3e0c68eddfb0fec' 
  AND token = '3YI7ghZ7QUABeLSNFYKs5oPxv4IKVRWr5gDwOto0E/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}