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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1088b2276f724e279d804551f65ce17753d4f5fa7649ae039d5dedb1fa5b9dd3' 
  AND token = '9jWsGEE3RcIRsQQyzPp0U6l+edARV0qOApVUcNBLWIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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