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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '959c07bec46961b6a4c95d1367799b0012cd634322842680b34aac64ad5ec65b' 
  AND token = '7/X7T+hTtxwaVdXSCdbOIlWUUz7bpUtmHD9Xk6xfOD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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