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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec173c529bb7420e5104395ccbca7e179d8f650fb72a0fc9aabae54e5d06bffd' 
  AND token = 'dRsvI76cEvpH02Wo39SIUXa+SZyIXNguLtxK2LTzfB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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