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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0135ac63bce36068b519862cb2ad055a100d33f7fb0b774408561c73cb6c3393' 
  AND token = '/2yIENL6qGsK0bu6eizH///2dWqR2zw5TTHM7pkE3o0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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