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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f92c270e134b7d7d7c39e4c112045daa7e15660d73155c6a735a18f42f058fc2' 
  AND token = 'CBrTCmp52f1rI/+adqewlVT7tZSZcsNqrif5p3hzegI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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