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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92d8733cd3acf477010e60188bdb78a51cb89fa17413db401a69adbbec3e15b2' 
  AND token = '7Hqh3OCK+FgWjBavs/kfiE6BWs8Rk/S8uDLhyeWH14A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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