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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e09562fecd48de108049a81bf0c8163766f303d6d2a572a5d72db9ff84d07acf' 
  AND token = '2ISTMXLW/6puCJ0v3u9i11ynfzh/B+Yvfw1EJTzeXwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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