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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c58aede2a7ef0bd8e2f82b194bb2d5dc02439815edd2860d292cb365edb4c13' 
  AND token = '19aPRYgTmFA+RBX/iTgM7CSGq9I5hZd04II9qxUWw48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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