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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17fca008b79f6b66308df4c252ae37a167424d3ab5fe9b2dc8fda84d9c70c61d' 
  AND token = 'f+UfB1WZSRv4gIV3D0w4OjRsWF6OO4y4gEFG/DPq0aE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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