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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19a7d3b0ea905c8875c81ecc7a6ea0205d96bf64f6ee41515cf96a46df97e871' 
  AND token = 'QjgPAm0JI/NbxzQkbwVZpCidQ8My1n/jTVAnyZfWTeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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