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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '905ee70be345ee738e30c2def8ff2489b0b8dc58f401b34f9df19177609af6a6' 
  AND token = '/LpVlA21vBe9x7inc4yej4+gb3ulpZ0xJcJ79FQWyvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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