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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02f4c02cb3b727efb1cce77ec5a86568503e0a185661282044b78b9437a3d842' 
  AND token = 'GNXa3bQHHw82l0yY/vZemCZ6vlcRBXr+kk8BORpQZio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00097

JSON explain

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