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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daac982a1b8995fe1d5449ae2c92efa988ecf24b2606ef39ae871571d78c7fa7' 
  AND token = 'WcXZbmeZOqEJOXG55ns2bqqEN58S9v7NCpM0ldPwoYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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