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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fde45cd45e6e931947ddd5d3f1ef16907e64372b7a560742d8c4674ab50e7034' 
  AND token = 'Fvc7y255F+3JbUyj4cc/Kaps4SFVGYlhTig1dsPHGys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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