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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb17f39d0ec19ff5350551c81bd79059a9bc1576395059ca8eb3d6fbe952b030' 
  AND token = '2WPyB8f0UHrvas+drwZR6eKK4C/JMz62hKNldI7QOnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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