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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abe18db7c99af90bbc1e67454b303cabade5f5c8b41e8277959257d69f59792a' 
  AND token = 'e5iBQATa0vJF2llyx4wx1yJDomu7Oy4HAZ3ToY0N2UQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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