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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '976314526f02193a428abe549f1c264582e1f17e05db568f9b27649cbf3d56fd' 
  AND token = 'Oj3WwxjOQ6l5bvLQspOJ1MVIeb6ZJbMsc7XrtudWs+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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