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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5adb091fc494e0d1eeebc77d1925b6a992fc15baaec762588d682d0d3edcf892' 
  AND token = 'I9G86TKsxZmbKFK1KqywHskzKFbG1vqwE85nl2bcxYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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