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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '447cc5055682e8f8e988d0e78fdd9ad8eedb316a778e8c2277c9f34dfcc4e03d' 
  AND token = 'Rilj8Yp3/qF/wrWS/kx7DdOAz8bGLtlJcgDklIo4PD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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