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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47152df0fbf5ec5b3d67ac07c5edb41aded2e879a6f2d49c91f15627f7430e04' 
  AND token = 'SdCyTtrvpZUxCApseReoz+6Ankg8KvzRoJUheLeVWJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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