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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad63cb48cbc790ffda0dcd0c5f0be07cf24f8a2eec293911141d8a93a32595f8' 
  AND token = 'FJb5bHra5J8rirxsYNk1uf9XJQd/pk20p7BgM80P9e8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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