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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab08c6f0bcc494445cedc812f9fe201261f864edde24c8e7f95a0c0f409aa645' 
  AND token = '/eKZiDl3ypGjGnWPSiYB1YZa11C7QNfBsizhZbRRTJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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