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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '548ea6976b04a11b44b137b811be395a2ebd1a6ea4307075e2832667069c5667' 
  AND token = '/OVgjGWy7QnHcAfpxOYMOK6S9GqYahqyNO2UsdJff7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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