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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c965736ade91a7b1a6e276eef56d28cebbe7863e1542f146398ea9abd7421a4' 
  AND token = 'cYK6pkB2YeiNeUdavnO0Uf2ctlQ5trL2AUrkKBTYX74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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