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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dc6ead16dd11a1b88a705e7dc09322d9b8a1b9f98f7e00272048b72c4c6694c' 
  AND token = 'a2gLp6LBFnuZDWo3Av64bVy2PXpvqYOM15pxe8ixu28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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