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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ad0b7d1402956f685ae526bb6680a17322a4e34faab1f08c7a23852ee264d08' 
  AND token = 'tgz1rVl9SJAsujo6DmTam3v4QWPfL/IJoX7QOOma8H0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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