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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00bc2d35ae7db862977b7385d19a50da353ee530ab35257b7d91319b76bc700a' 
  AND token = 'o/LEi2psutqsjtqPCU8AXqam879duXqevWJ8UQfekUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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