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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f16afa759555e96ce0ade97e9c9dcdf157d99d5d836cab2364e583c5fb9a062' 
  AND token = 'hBos5XtxymkAUGAnTtw5wliPj7mjcG5wuBBGrV4cgbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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