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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6abcbe1568a46a3423766222d367a83e92466e845d979bbc1b05ace866f6e66a' 
  AND token = 'brz3pHUNv7nYMBvfG34WjXDS2WPd91CHJw7NH5yj0lU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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