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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92be7c05f8855749112906fc763d322b0ce41e203ed6ad2b9c9c978bad1db3d5' 
  AND token = 'CXM7eP/0qdzmn876i38kP+NP1fx4bzWuE7jLQMVtkZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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