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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9079a285c457bc6b4e50b898490d6bcf277d762404a621bb2e1d2a37d1241bdc' 
  AND token = 'xIfS/vzIVuzhAjqZ9oZcAjptDq40OWIA2wdswCXA4SQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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