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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c993e3ec1651634a09a14a1d8606e86f156a04132b0bd2c1c97c95e17b1ee41' 
  AND token = '79VaFOOw2mTO4mNRqm/lzjSy7WECcsc//2rRWfWgJco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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