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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42b1b1f130e98db8be2629e3925868bd5f4fece21dc3ab7f358c91aa71ed26bb' 
  AND token = 'GR5fxIwkoWLewtJDB+F9lJv4iSZXmc0qOmt1SV4w0Kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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