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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acd494e62734838cf659fdbaaecb9eea31ee9e59ebc4392a18d2660661478d3f' 
  AND token = 'N++3k+7y61WuZwBn7wp+RCu/SBFaI4BuaM+FaGLL2nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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