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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d9a7c6154d2f8de141b0deb72fbe41612abd7dc8659bb771b81575fa5b4605c' 
  AND token = '4Y1+KOfNkzFA593hYZBR535oHO/PuNuC6QuAXdPTPIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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