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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bf9a4ef13bdca253d18fa739f9f4873f73dff596851f6068e37af75afd2ddb3' 
  AND token = 'Hg/vCfeanD0RaSrBrF0bDE+MycNRfCyRXCUa8SE3zNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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