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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd76eb1fbdf8cc91d7f36b0c455236948c9d5ccc8a604ce76bb882acd57ea07f0' 
  AND token = 'zv3zLdkSc903uEcv5boI+xCdYkBEGLiUeu4O6tBxOoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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