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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cf00a7c98c5fe83e85e6b93058a820cb6553ac07598b3bf3fbdf0e94f6f3fb6' 
  AND token = 'KndTM2Zg6haeSQDQ1lHK38W6NCoo2CJFDWC2sHevGTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00097

JSON explain

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