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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4702b6be6abc9aba6195c72aa91319085d8d249342c5a61d65558fcc2da8ddf9' 
  AND token = 'nM42rEnD31ypXZZ8NO1i8HHTLtWR8+e1RX5SlknOesI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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