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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eedca846f5c8617a41c61170233284a802533f20049f0d8b110fb3d68e268ae' 
  AND token = '/m1CNaADOYZMROKvt+jDun/++nUPw/5Tb1SMA2qLH6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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