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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8843e1fb9235be99e3cc9fef845ef2a86f945db9d67e8c056a4b7a509332a237' 
  AND token = '6PfvkTIX6Nu2ZeFYLcbJirLabxQCu3bB17WsRfJVSWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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