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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b12741a0525d70007ce6cc5b72292cacfe2d3e48a7f284c734dca5d342e05299' 
  AND token = '5sUUqSWshaLwVNSmKw2vB3SRUcXNsboPuXBPefxyPOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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