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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2c89c9a62ecf44ec1b22f271810ee01dce1644b28f5043e218c4417f5dd34c8' 
  AND token = 'nfYPvEuJlTNWsDDQRbD7X99C3k8o35IijBC4OL3VtK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00113

JSON explain

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