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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b55595f63d778ee755d4e8feeabe84a3b4b1718ec6b8ca1d7374d029b75a36b' 
  AND token = '5hsZRnLHKrr7f2TuvC+La8i5Q1/DbD74bW5yMZYajKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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