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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc7f52e948e27aa2cbd0caf6b8323ad96e6f2b5c61289c562cbb422b8ce31826' 
  AND token = 'gq/f9Z7w8fHau1aHjf+fTu1ZCCdhxgVXhEk3RHMffQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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