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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcfd9485db3b3a42453dcb45f13f7b50bd06c94ae819437bd019866ef82d0d7b' 
  AND token = '1FpoPL3F1LmKCLQIcRo5BOm5ZhdwI+R4gO4UTfeV2x8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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