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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5fbcdd13d462c509a02ac90f4c18edd1f9eef84a98b4cfaa7cb09bc5bf2e74c' 
  AND token = '6DC5KM6009gF9lNgdZZ/5y/NWlcoPLseZyqmio4MWsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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