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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25badb67cd1daef02f802565ed412ce935c2cac64905720612f341c25f1e9cbb' 
  AND token = 'TxEr6QvOZnjmMmlMZMXODhM8rX0Gbxjm5WQQu8Ls4vA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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