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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1000ed97502eae74492d356baabe8c0180d51e0d0bc02b65e841ceb03b91f264' 
  AND token = 'Cfw7MT/jBu/9zjWLqVcgB3sNp5FDscDrbQqmms4mI6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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