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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ece42f8ba5c3ae3752499a1762105c39e8a8c86ec37d8e93d0eba32dbf86443' 
  AND token = 't10tS6UCi3IYtaJ50o/T8ia9QK04IBBvrvDuPugwnMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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