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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67bfbd58e140a3a08f9378f90f2b8d46f41c57585c746545ec5a9692ee1f373b' 
  AND token = '4gEPBf40xxdbdxKcjBt8sZ5kp8rcP0kI5itiad+8enM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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