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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3e967624c5f9c489cfa8658a206100a6f8e7fc2b7bdfda6bb84640d824fb447' 
  AND token = 'kf13dgT6Q4jgERCcdybIHvMToULQXbU1MMrhUK9ZWMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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