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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03cdf148018d1a2d03290226c3f129e94691af1fc35b71fbfde35e2c2d81767b' 
  AND token = 'i73WG5yitb19WVA7ifFbfFO+hZfDcP+yVG451JBOPSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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