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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6164a1ee5ab693a618bd5381ca586bc61d50eef2d30ae2d4412da76c22276b87' 
  AND token = 'pxZvWvQjO5oX4UEQc8S5Agi6NU+Gv3R10nShUBz3NZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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