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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23f5720c14a16f93beb4462aee5dba4dc07b18e8870615fa5b9f755531b19460' 
  AND token = 'Q1YRKxrr+N5IpG5LX2OKZCZ6stSj+9oejFu2GwFtpDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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