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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83571e92ed06144e99e3574d5630dbc2d2a6fa08c82911e520bd839c89339977' 
  AND token = 'L8f7sbWIXZm65RIX/gN7q47+KgaVKpsOCsdTJMcmSi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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