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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0366e9b7ca0f622e81d4101bb910545ed62f429b1d6c867664a6b45a17761a01' 
  AND token = 'OmbkdxUgiWyzMwFQki1ChpNEcJqsAHAZ6b/xbhgl0Qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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