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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b34afa54abde8b6d7cb32c3621cec63e0b3a23ae4aa21372a164e3e56edf08c' 
  AND token = 'mQjCQfuXjHwE+oSCJhITYdHz7Y89NqbLLTyfxioGOB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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