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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd67bfba8b1258005c7903fde5245bd9c4062215f5f33af9232438edd0e081c9' 
  AND token = 'nLbJDe84bENNvHzM5M1gv4Mi2CSP3mvR5FutlLChDPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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