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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30cb82a980ecd10f3fcdfb5b598958f3c9bb34a95dc113881750cc4b4c5d9391' 
  AND token = 'C1PnGzH1IGSsSMlujpeLwaWcckkzepUYxsDHi6r//po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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