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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca029aa5641401f17b30b40415fe0f5956969339a1c664a3c30fc0afcea95524' 
  AND token = '1eQ94Ppy6iqblte1CqHKUyNZ5RySPW973WO/tZRbHzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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