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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a248989a1dbb261f1948de2fe1258072a04b0fbc4a453aa543d70f93a1b590f1' 
  AND token = '+2Uy5q4x0A7OdwiBLZJ5FhvIdeRLahaHHeIpiUC1qvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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