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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a8bf75e690ad8ce4e0d822d58cac910fc70a063f6476c5a544d95aa1fffeeef' 
  AND token = 'TOu52eR/Z1kbpK5ySZGdgqE62cx1U4MXJkIXHLQQitE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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